1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)if.c 6.9 (Berkeley) 09/16/85 7 */ 8 9 #include "param.h" 10 #include "systm.h" 11 #include "socket.h" 12 #include "socketvar.h" 13 #include "protosw.h" 14 #include "dir.h" 15 #include "user.h" 16 #include "kernel.h" 17 #include "ioctl.h" 18 #include "errno.h" 19 20 #include "if.h" 21 #include "af.h" 22 23 #include "ether.h" 24 25 int ifqmaxlen = IFQ_MAXLEN; 26 27 /* 28 * Network interface utility routines. 29 * 30 * Routines with ifa_ifwith* names take sockaddr *'s as 31 * parameters. 32 */ 33 34 ifinit() 35 { 36 register struct ifnet *ifp; 37 38 for (ifp = ifnet; ifp; ifp = ifp->if_next) 39 if (ifp->if_snd.ifq_maxlen == 0) 40 ifp->if_snd.ifq_maxlen = ifqmaxlen; 41 if_slowtimo(); 42 } 43 44 #ifdef vax 45 /* 46 * Call each interface on a Unibus reset. 47 */ 48 ifubareset(uban) 49 int uban; 50 { 51 register struct ifnet *ifp; 52 53 for (ifp = ifnet; ifp; ifp = ifp->if_next) 54 if (ifp->if_reset) 55 (*ifp->if_reset)(ifp->if_unit, uban); 56 } 57 #endif 58 59 /* 60 * Attach an interface to the 61 * list of "active" interfaces. 62 */ 63 if_attach(ifp) 64 struct ifnet *ifp; 65 { 66 register struct ifnet **p = &ifnet; 67 68 while (*p) 69 p = &((*p)->if_next); 70 *p = ifp; 71 } 72 73 /* 74 * Locate an interface based on a complete address. 75 */ 76 /*ARGSUSED*/ 77 struct ifaddr * 78 ifa_ifwithaddr(addr) 79 struct sockaddr *addr; 80 { 81 register struct ifnet *ifp; 82 register struct ifaddr *ifa; 83 84 #define equal(a1, a2) \ 85 (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0) 86 for (ifp = ifnet; ifp; ifp = ifp->if_next) 87 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 88 if (ifa->ifa_addr.sa_family != addr->sa_family) 89 continue; 90 if (equal(&ifa->ifa_addr, addr)) 91 return (ifa); 92 if ((ifp->if_flags & IFF_BROADCAST) && 93 equal(&ifa->ifa_broadaddr, addr)) 94 return (ifa); 95 } 96 return ((struct ifaddr *)0); 97 } 98 /* 99 * Locate the point to point interface with a given destination address. 100 */ 101 /*ARGSUSED*/ 102 struct ifaddr * 103 ifa_ifwithdstaddr(addr) 104 struct sockaddr *addr; 105 { 106 register struct ifnet *ifp; 107 register struct ifaddr *ifa; 108 109 for (ifp = ifnet; ifp; ifp = ifp->if_next) 110 if (ifp->if_flags & IFF_POINTOPOINT) 111 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 112 if (ifa->ifa_addr.sa_family != addr->sa_family) 113 continue; 114 if (equal(&ifa->ifa_dstaddr, addr)) 115 return (ifa); 116 } 117 return ((struct ifaddr *)0); 118 } 119 120 /* 121 * Find an interface on a specific network. If many, choice 122 * is first found. 123 */ 124 struct ifaddr * 125 ifa_ifwithnet(addr) 126 register struct sockaddr *addr; 127 { 128 register struct ifnet *ifp; 129 register struct ifaddr *ifa; 130 register u_int af = addr->sa_family; 131 register int (*netmatch)(); 132 133 if (af >= AF_MAX) 134 return (0); 135 netmatch = afswitch[af].af_netmatch; 136 for (ifp = ifnet; ifp; ifp = ifp->if_next) 137 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) { 138 if (ifa->ifa_addr.sa_family != addr->sa_family) 139 continue; 140 if ((*netmatch)(&ifa->ifa_addr, addr)) 141 return (ifa); 142 } 143 return ((struct ifaddr *)0); 144 } 145 146 /* 147 * Find an interface using a specific address family 148 */ 149 struct ifaddr * 150 ifa_ifwithaf(af) 151 register int af; 152 { 153 register struct ifnet *ifp; 154 register struct ifaddr *ifa; 155 156 for (ifp = ifnet; ifp; ifp = ifp->if_next) 157 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 158 if (ifa->ifa_addr.sa_family == af) 159 return (ifa); 160 return ((struct ifaddr *)0); 161 } 162 163 /* 164 * Mark an interface down and notify protocols of 165 * the transition. 166 * NOTE: must be called at splnet or eqivalent. 167 */ 168 if_down(ifp) 169 register struct ifnet *ifp; 170 { 171 register struct ifaddr *ifa; 172 173 ifp->if_flags &= ~IFF_UP; 174 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 175 pfctlinput(PRC_IFDOWN, &ifa->ifa_addr); 176 } 177 178 /* 179 * Handle interface watchdog timer routines. Called 180 * from softclock, we decrement timers (if set) and 181 * call the appropriate interface routine on expiration. 182 */ 183 if_slowtimo() 184 { 185 register struct ifnet *ifp; 186 187 for (ifp = ifnet; ifp; ifp = ifp->if_next) { 188 if (ifp->if_timer == 0 || --ifp->if_timer) 189 continue; 190 if (ifp->if_watchdog) 191 (*ifp->if_watchdog)(ifp->if_unit); 192 } 193 timeout(if_slowtimo, (caddr_t)0, hz / IFNET_SLOWHZ); 194 } 195 196 /* 197 * Map interface name to 198 * interface structure pointer. 199 */ 200 struct ifnet * 201 ifunit(name) 202 register char *name; 203 { 204 register char *cp; 205 register struct ifnet *ifp; 206 int unit; 207 208 for (cp = name; cp < name + IFNAMSIZ && *cp; cp++) 209 if (*cp >= '0' && *cp <= '9') 210 break; 211 if (*cp == '\0' || cp == name + IFNAMSIZ) 212 return ((struct ifnet *)0); 213 unit = *cp - '0'; 214 for (ifp = ifnet; ifp; ifp = ifp->if_next) { 215 if (bcmp(ifp->if_name, name, (unsigned)(cp - name))) 216 continue; 217 if (unit == ifp->if_unit) 218 break; 219 } 220 return (ifp); 221 } 222 223 /* 224 * Interface ioctls. 225 */ 226 ifioctl(so, cmd, data) 227 struct socket *so; 228 int cmd; 229 caddr_t data; 230 { 231 register struct ifnet *ifp; 232 register struct ifreq *ifr; 233 234 switch (cmd) { 235 236 case SIOCGIFCONF: 237 return (ifconf(cmd, data)); 238 239 #if (defined(INET) || defined(BBNNET)) && NETHER > 0 240 case SIOCSARP: 241 case SIOCDARP: 242 if (!suser()) 243 return (u.u_error); 244 /* FALL THROUGH */ 245 case SIOCGARP: 246 return (arpioctl(cmd, data)); 247 #endif 248 } 249 ifr = (struct ifreq *)data; 250 ifp = ifunit(ifr->ifr_name); 251 if (ifp == 0) 252 return (ENXIO); 253 switch (cmd) { 254 255 case SIOCGIFFLAGS: 256 ifr->ifr_flags = ifp->if_flags; 257 break; 258 259 case SIOCSIFFLAGS: 260 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 261 int s = splimp(); 262 if_down(ifp); 263 splx(s); 264 } 265 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 266 (ifr->ifr_flags &~ IFF_CANTCHANGE); 267 if (ifp->if_ioctl) 268 (void) (*ifp->if_ioctl)(ifp, cmd, data); 269 break; 270 271 default: 272 if (so->so_proto == 0) 273 return (EOPNOTSUPP); 274 return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 275 cmd, data, ifp)); 276 } 277 return (0); 278 } 279 280 /* 281 * Return interface configuration 282 * of system. List may be used 283 * in later ioctl's (above) to get 284 * other information. 285 */ 286 /*ARGSUSED*/ 287 ifconf(cmd, data) 288 int cmd; 289 caddr_t data; 290 { 291 register struct ifconf *ifc = (struct ifconf *)data; 292 register struct ifnet *ifp = ifnet; 293 register struct ifaddr *ifa; 294 register char *cp, *ep; 295 struct ifreq ifr, *ifrp; 296 int space = ifc->ifc_len, error = 0; 297 298 ifrp = ifc->ifc_req; 299 ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2; 300 for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) { 301 bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2); 302 for (cp = ifr.ifr_name; cp < ep && *cp; cp++) 303 ; 304 *cp++ = '0' + ifp->if_unit; *cp = '\0'; 305 if ((ifa = ifp->if_addrlist) == 0) { 306 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 307 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr)); 308 if (error) 309 break; 310 space -= sizeof (ifr), ifrp++; 311 } else 312 for ( ; space > sizeof (ifr) && ifa; ifa = ifa->ifa_next) { 313 ifr.ifr_addr = ifa->ifa_addr; 314 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr)); 315 if (error) 316 break; 317 space -= sizeof (ifr), ifrp++; 318 } 319 } 320 ifc->ifc_len -= space; 321 return (error); 322 } 323